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/* $OpenBSD: poll.c,v 1.6 2016/09/20 17:25:06 otto Exp $ */
/* David Leonard <d@openbsd.org>, 2001. Public Domain. */
#include <pthread.h>
#include <fcntl.h>
#include <poll.h>
#include <paths.h>
#include <unistd.h>
#include <stdlib.h>
#include <util.h>
#include "test.h"
#define POLLALL (POLLIN|POLLOUT|POLLERR|POLLNVAL)
static void
print_pollfd(struct pollfd *p)
{
printf("{fd=%d, events=< %s%s%s> revents=< %s%s%s%s%s>}",
p->fd,
p->events & POLLIN ? "in " : "",
p->events & POLLOUT ? "out " : "",
p->events & ~(POLLIN|POLLOUT) ? "XXX " : "",
p->revents & POLLIN ? "in " : "",
p->revents & POLLOUT ? "out " : "",
p->revents & POLLERR ? "err " : "",
p->revents & POLLHUP ? "hup " : "",
p->revents & POLLNVAL ? "nval " : ""
);
}
static void *
writer(void *arg)
{
int fd = *(int *)arg;
const char msg[1] = { '!' };
ASSERTe(write(fd, &msg, sizeof msg), == sizeof msg);
return NULL;
}
static void *
reader(void *arg)
{
int fd = *(int *)arg;
char buf[1];
ASSERTe(read(fd, &buf, sizeof buf), == sizeof buf);
return NULL;
}
int
main(int argc, char *argv[])
{
pthread_t t;
void *result;
int null, zero, tty, dummy;
int tube[2];
struct pollfd p[3];
/* Try an empty poll set */
ASSERTe(poll(NULL, 0, 0), == 0);
CHECKe(zero = open(_PATH_DEV "zero", O_RDONLY));
CHECKe(null = open(_PATH_DEV "null", O_WRONLY));
CHECKe(openpty(&dummy, &tty, NULL, NULL, NULL));
/* Try both descriptors being ready */
p[0].fd = zero;
p[0].events = POLLIN|POLLOUT;
p[0].revents = 0;
p[1].fd = null;
p[1].events = POLLIN|POLLOUT;
p[1].revents = 0;
ASSERTe(poll(p, 2, 0), == 2); /* if 4 then bug in kernel not fixed */
printf("zero p[0]="); print_pollfd(&p[0]); putchar('\n');
printf("null p[1]="); print_pollfd(&p[1]); putchar('\n');
ASSERT((p[0].revents & POLLIN) == POLLIN);
ASSERT((p[1].revents & POLLOUT) == POLLOUT);
/*
* Try one of the descriptors being invalid
* and the other ready
*/
printf("closing zero\n");
close(zero);
p[0].fd = zero;
p[0].events = POLLIN|POLLOUT;
p[1].fd = null;
p[1].events = POLLIN|POLLOUT;
ASSERTe(poll(p, 2, 0), == 2); /* again, old kernels had this bug */
printf("zero p[0]="); print_pollfd(&p[0]); putchar('\n');
printf("null p[1]="); print_pollfd(&p[1]); putchar('\n');
ASSERT((p[0].revents & POLLNVAL) == POLLNVAL);
ASSERT((p[1].revents & POLLOUT) == POLLOUT);
printf("closing null\n");
close(null);
/*
* New pipes. the write end should be writable (buffered)
*/
CHECKe(pipe(tube));
CHECKe(fcntl(tube[0], F_SETFL, O_NONBLOCK));
CHECKe(fcntl(tube[1], F_SETFL, O_NONBLOCK));
p[0].fd = tube[0];
p[0].events = POLLIN;
p[1].fd = tube[1];
p[1].events = POLLOUT;
ASSERTe(poll(p, 2, 0), == 1);
printf("rpipe p[0]="); print_pollfd(&p[0]); putchar('\n');
printf("wpipe p[1]="); print_pollfd(&p[1]); putchar('\n');
ASSERT(p[0].revents == 0);
ASSERT(p[1].revents == POLLOUT);
/* Start a writing thread to the write end [1] */
printf("bg writing to wpipe\n");
CHECKr(pthread_create(&t, NULL, writer, (void *)&tube[1]));
/* The read end [0] should soon be ready for read (POLLIN) */
p[0].fd = tube[0];
p[0].events = POLLIN;
ASSERTe(poll(p, 1, INFTIM), == 1);
printf("rpipe p[0]="); print_pollfd(&p[0]); putchar('\n');
ASSERT(p[0].revents == POLLIN);
reader((void *)&tube[0]); /* consume */
CHECKr(pthread_join(t, &result));
SUCCEED;
}
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